How to add MouseOverHandler into AbsolutePanel

Please see the following code for my implementation. AbsolutePanel never fires mouse over event although I move mouse. Method highlight(int, int) is called one time only for first click.  Please help me out.

Thanks.

public class MyPanel extends AbsolutePanel implements HasMouseOverHandlers {

public MyPanel (Element elem) {

super(elem);

sinkEvents(Event.ONMOUSEOVER);

    

   

   addMouseOverHandler(new MouseOverHandler() {

@Override

public void onMouseOver(MouseOverEvent event) {

int x = event.getClientX();

int y = event.getClientY();

highlight(x, y);

}

});

   

   addDomHandler(new ClickHandler() {

@Override

public void onClick(ClickEvent event) {

int x = event.getClientX();

int y = event.getClientY();

showConfigurationPanel(x, y);

}

}, ClickEvent.getType());

   

   onAttach(); //It must be attached

}

private void showConfigurationPanel(int x, int y) {

 

}

private void highlight(int x, int y) {

}

@Override

public HandlerRegistration addMouseOverHandler(MouseOverHandler handler) {

return addDomHandler(handler, MouseOverEvent.getType());  

}

}

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